<div class="app flex-row align-items-center">
    <div class="container">
        <div class="row justify-content-center">
            <div class="col-md-6">
                <div class="clearfix">
                    <h1 class="float-left display-3 mr-2">404</h1>
                    <h4 class="pt-1">Oops! You're lost.</h4>
                    <p class="text-muted">The page you are looking for was not found.</p>
                </div>
                <div class="input-prepend input-group">
                    <span class="input-group-addon"><i class="fa fa-search"></i>
                    </span>
                    <input id="prependedInput" class="form-control" size="16" type="text" placeholder="What are you looking for?">
                    <span class="input-group-btn">
                        <button class="btn btn-info" type="button">Search</button>
                    </span>
                </div>
            </div>
        </div>
    </div>
</div>
